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http://www.xedox.de/simelf/emu.html Cosmac ELF Emulator


Links: http://www.cosmacelf.com/

http://www.elf-emulation.com/

http://www.sparetimegizmos.com/Hardware/Elf2K.htm

https://billr.incolor.com/computer_simulators.htm

http://www.decodesystems.com/cosmac/index.html

http://humanoidolabs.blogspot.com/2012/03/propeller-elf-ii.html


More Programming. The single-line output program shown below is a simple program that will flash the Q LED at a preset rate. It also provides a programmable square wave on the Q line.

Step M Bytes Comment

1 0000 7A 0-->Q

2 0001 F8 10 B1 10-->R1.1

3 0004 21 R1.1

4 0005 91 R1.1-->D

5 0006 3A 04 Repeat step 3 if D = 00

6 0008 31 00 Go to step 1 if Q = 1

7 000A 7B 1-->Q

8 000B 30 01 Go to step 2

7A__0111__1010

F8__1111__1000

10__0001__0000

B1__1011__0001

21__0010__0001

91__1001__0001

3A__0011__1010

04__0000__0100

31__0011__0001

00__0000__0000

7B__0111__1011

30__0011__0000

01__0000__0001


When you run this program, the square-wave frequently depends on the settings of the input switches. You can change frequency at any time. For higher frequencies, change B1 at M(0006) to A1 and 91 at M(0008) to 81. You can now select any of 256 different frequencies by altering the settings of the switches.